Use this method if your router does not have an internet connection or if the online update fails. How To Update Router Firmware
This is the simplest method and is available on most newer models like the How to update router firmware | Lenovo US
If the update fails and the router becomes unresponsive, try the : manually set your PC’s IP to a static address (e.g., 192.168.1.10), connect via Ethernet, hold the reset button while powering on for 30 seconds, then access a specialized recovery page (often 192.168.1.1 with a TFTP server). Consult ZTE’s documentation—some models have a hidden recovery mode.
